2010 Fiscal Year Final Research Report
Chemical state of trace elements and their chemical behavior during sedimentation and diagenesis: proxy for paleoenvironment
| Project/Area Number |
20540475
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | Hiroshima University |
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Principal Investigator |
SHIMIZU Hiroshi Hiroshima University, 大学院・理学研究科, 名誉教授 (60090544)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Yoshio 広島大学, 大学院・理学研究科, 教授 (10304396)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 微量元素 / 希土類元素 / 堆積過程 / 続成過程 / 化学状態 / 古環境 / 堆積物 |
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| Research Abstract |
Chemical state of trace elements such as rare earth elements (REE) and their chemical behavior during sedimentation and diagenesis were studied, in order to examine trace elements in sediments on the geochemical tracer reflecting their sedimentation environments. It is shown on marine sediments that REE incorporated into Mn oxides during sedimentation were released from Mn oxide dissolution during diagenesis, but the released REE were absorbed to phosphate phase such as apatite during the diagenesis. REE patterns in sedimentary rocks are confirmed to inherit their features as a whole through sedimentation and diagenesis and to be an useful geochemical tool reflecting the depositional environment.
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